检查PHP中数组的大小

Question

我正在尝试找出这个数组的大小是6还是更大。我正在计算第二个级别(其中表示为size=10)。最简单的方法是什么？

它在这里被转储：

ARRAY (SIZE=1)
  0 => 
    ARRAY (SIZE=10)
      'ID' => INT 35
      'ALT' => STRING '' (LENGTH=0)
      'TITLE' => STRING 'FD-7' (LENGTH=4)
      'CAPTION' => STRING 'THIS IS THE FIFTH CAPTION FOR THE PHOTOGRAPH.' (LENGTH=45)
      'DESCRIPTION' => STRING '' (LENGTH=0)
      'MIME_TYPE' => STRING 'IMAGE/JPEG' (LENGTH=10)
      'URL' => STRING 'HTTP://FASHION-DETAIL.DEV/WP-CONTENT/UPLOADS/2014/02/FD-7.JPG' (LENGTH=61)
      'WIDTH' => INT 432
      'HEIGHT' => INT 650
      'SIZES' => 
        ARRAY (SIZE=9)
          'THUMBNAIL' => STRING 'HTTP://FASHION-DETAIL.DEV/WP-CONTENT/UPLOADS/2014/02/FD-7.JPG' (LENGTH=61)
          'THUMBNAIL-WIDTH' => INT 63
          'THUMBNAIL-HEIGHT' => INT 96
          'MEDIUM' => STRING 'HTTP://FASHION-DETAIL.DEV/WP-CONTENT/UPLOADS/2014/02/FD-7.JPG' (LENGTH=61)
          'MEDIUM-WIDTH' => INT 432
          'MEDIUM-HEIGHT' => INT 650
          'LARGE' => STRING 'HTTP://FASHION-DETAIL.DEV/WP-CONTENT/UPLOADS/2014/02/FD-7.JPG' (LENGTH=61)
          'LARGE-WIDTH' => INT 432
          'LARGE-HEIGHT' => INT 650

Answer 1

对count()应用COUNT_RESURSIVE标志

$result = count($array, COUNT_RECURSIVE);

-for整个数组。如果只想计算某些元素的数量，可以像这样传递：

//$key is your element's index
$result = count($array[$key]);

最后，要仅从第二级获取计数，您可以应用：

$array = [
   ['foo', 'bar'],
   ['baz'],
   [],
   ['bee', 'feo']
];

$result = array_sum(array_map('count', $array));//5